diff --git a/internal/agentcatalog/agentcatalog.go b/internal/agentcatalog/agentcatalog.go
index ad92d93..2c7e083 100644
--- a/internal/agentcatalog/agentcatalog.go
+++ b/internal/agentcatalog/agentcatalog.go
@@ -58,7 +58,15 @@ type Agent struct {
 }
 
 // PrefixedName is the on-disk file basename for this agent.
+//
+// A catalog name that already starts with the prefix is returned unchanged,
+// so a server-side "praxis-dag" installs as praxis-dag rather than
+// praxis-praxis-dag. The reserved-namespace invariant that the cleanup globs
+// depend on holds either way. Mirrors skillcatalog.Skill.PrefixedName.
 func (a Agent) PrefixedName() string {
+	if strings.HasPrefix(a.Name, PrefixAgent) {
+		return a.Name
+	}
 	return PrefixAgent + a.Name
 }
 
diff --git a/internal/agentcatalog/agentcatalog_test.go b/internal/agentcatalog/agentcatalog_test.go
index 568bfbe..e9fcfe4 100644
--- a/internal/agentcatalog/agentcatalog_test.go
+++ b/internal/agentcatalog/agentcatalog_test.go
@@ -11,9 +11,31 @@ import (
 )
 
 func TestAgentPrefixedName(t *testing.T) {
-	a := Agent{Name: "foo", Kind: KindAgent}
-	if got := a.PrefixedName(); got != "praxis-foo" {
-		t.Errorf("PrefixedName() = %q, want praxis-foo", got)
+	cases := []struct {
+		in, want string
+	}{
+		{"foo", "praxis-foo"},
+
+		// An agent already authored as praxis-<n> server-side installs as-is
+		// rather than becoming praxis-praxis-<n>. Same rule as skillcatalog's
+		// PrefixedName — see the comment there.
+		{"praxis-dag", "praxis-dag"},
+
+		// Only an exact prefix match collapses.
+		{"my-praxis-dag", "praxis-my-praxis-dag"},
+		{"praxisdag", "praxis-praxisdag"},
+		{"praxis-", "praxis-"},
+	}
+	for _, tc := range cases {
+		a := Agent{Name: tc.in, Kind: KindAgent}
+		got := a.PrefixedName()
+		if got != tc.want {
+			t.Errorf("PrefixedName(%q) = %q, want %q", tc.in, got, tc.want)
+		}
+		if !strings.HasPrefix(got, PrefixAgent) {
+			t.Errorf("PrefixedName(%q) = %q; must stay inside the %q namespace",
+				tc.in, got, PrefixAgent)
+		}
 	}
 }
 
diff --git a/internal/skillcatalog/skillcatalog.go b/internal/skillcatalog/skillcatalog.go
index 02b11a7..01a1e91 100644
--- a/internal/skillcatalog/skillcatalog.go
+++ b/internal/skillcatalog/skillcatalog.go
@@ -64,7 +64,18 @@ func (s Skill) IsMultiFile() bool {
 // PrefixedName is the on-disk skill folder name (e.g. praxis-incident-investigator).
 // Skills the CLI installs from the catalog always carry this prefix so they
 // can't collide with user-authored or third-party skills.
+//
+// A catalog name that already starts with the prefix is returned unchanged.
+// Some server-side skills are authored as "praxis-dag" / "praxis-dag-runner";
+// blindly concatenating produced "praxis-praxis-dag" on disk. Collapsing is
+// safe because the invariant the cleanup globs depend on is only that the
+// installed folder LIVES IN the praxis- namespace — which holds either way —
+// and nothing reverse-maps a folder name back to its catalog name by
+// stripping exactly one prefix.
 func (s Skill) PrefixedName() string {
+	if strings.HasPrefix(s.Name, PraxisPrefix) {
+		return s.Name
+	}
 	return PraxisPrefix + s.Name
 }
 
diff --git a/internal/skillcatalog/skillcatalog_test.go b/internal/skillcatalog/skillcatalog_test.go
index 4cfa9bc..57d51c8 100644
--- a/internal/skillcatalog/skillcatalog_test.go
+++ b/internal/skillcatalog/skillcatalog_test.go
@@ -253,9 +253,24 @@ func TestPrefixedName_AlwaysPrefixed(t *testing.T) {
 		in, want string
 	}{
 		{"k8s-ops", "praxis-k8s-ops"},
-		{"already-praxis-prefix-but-still-prefixed-once-more", "praxis-already-praxis-prefix-but-still-prefixed-once-more"},
-		// We do NOT collapse double-prefixes — keeps the rule "if it starts
-		// with praxis-, the CLI installed it" mechanical.
+
+		// Server-side catalog names that ALREADY carry the praxis- prefix are
+		// installed as-is rather than double-prefixed. The namespace invariant
+		// the cleanup globs rely on — "an on-disk skill dir starting with
+		// praxis- was installed by this CLI" — is satisfied either way, so
+		// re-prefixing bought nothing and produced praxis-praxis-dag /
+		// praxis-praxis-dag-runner on real installs.
+		{"praxis-dag", "praxis-dag"},
+		{"praxis-dag-runner", "praxis-dag-runner"},
+
+		// Only an exact prefix match collapses. A name that merely *contains*
+		// the token, or starts with a lookalike, is still prefixed.
+		{"my-praxis-dag", "praxis-my-praxis-dag"},
+		{"praxisdag", "praxis-praxisdag"},
+
+		// Degenerate: the bare prefix is not a usable name; leave it alone
+		// rather than emitting "praxis-praxis-".
+		{"praxis-", "praxis-"},
 	}
 	for _, tc := range cases {
 		s := Skill{Name: tc.in}
@@ -265,6 +280,16 @@ func TestPrefixedName_AlwaysPrefixed(t *testing.T) {
 	}
 }
 
+// Whatever PrefixedName returns must keep the reserved-namespace invariant
+// that UninstallByPrefix / RemoveOrphanedByPrefix glob on.
+func TestPrefixedName_AlwaysInReservedNamespace(t *testing.T) {
+	for _, in := range []string{"k8s-ops", "praxis-dag", "my-praxis-dag", "praxisdag", "praxis-"} {
+		if got := (Skill{Name: in}).PrefixedName(); !strings.HasPrefix(got, PraxisPrefix) {
+			t.Errorf("PrefixedName(%q) = %q; must stay inside the %q namespace", in, got, PraxisPrefix)
+		}
+	}
+}
+
 func TestIsMultiFile(t *testing.T) {
 	if (Skill{}).IsMultiFile() {
 		t.Error("skill with no files should not be multi-file")
diff --git a/internal/skillinstall/dummy.go b/internal/skillinstall/dummy.go
index 555427a..fd48fad 100644
--- a/internal/skillinstall/dummy.go
+++ b/internal/skillinstall/dummy.go
@@ -96,6 +96,25 @@ praxis login --profile bigcorp     # wipes acme skills, installs bigcorp
 
 This meta-skill survives every switch. Only the catalog skills cycle.
 
+## Skill naming: ` + "`praxis-`" + ` is a reserved namespace
+
+Every skill this CLI installs lands under ` + "`praxis-<name>`" + `. That prefix is
+provenance, not part of the skill's identity — it marks "the Praxis CLI put
+this here" so login/logout can clean up its own files without touching
+user-authored skills.
+
+**Skills therefore refer to each other without the prefix.** When a Praxis
+skill body says ` + "`/design-facets-module`" + `, ` + "`/modules-repo-workflow`" + `, or
+` + "`/memory`" + `, it means the installed ` + "`/praxis-<name>`" + `. Resolve a bare
+` + "`/X`" + ` to ` + "`praxis-X`" + ` and invoke that. Do not report the bare name as a
+missing skill, and do not go looking for an unprefixed copy — there isn't
+one.
+
+This matters most for the module-authoring chain, which is a sequence of
+handoffs: design → build → test → publish. Each step names the next one
+bare. Run ` + "`praxis list-skills --json`" + ` if you need the exact installed
+names.
+
 ## Output convention
 
 Every AI-callable command supports ` + "`--json`" + ` and auto-emits JSON when
diff --git a/internal/skillinstall/dummy_test.go b/internal/skillinstall/dummy_test.go
index 9304a48..4e7ae63 100644
--- a/internal/skillinstall/dummy_test.go
+++ b/internal/skillinstall/dummy_test.go
@@ -49,3 +49,29 @@ func TestPraxisMetaSkill_RaptorIsLocalNotGateway(t *testing.T) {
 		t.Error("meta-skill uses the wrong shape `raptor.stale`; tools is an array — find the raptor entry")
 	}
 }
+
+// Catalog skills are installed under the reserved `praxis-` namespace, but
+// their bodies cross-reference each other by the BARE name — e.g.
+// praxis-build-facets-module says "Have you completed the
+// /design-facets-module skill?" and praxis-design-facets-module ends with
+// "Proceed to /build-facets-module". Those slash-names never exist on disk,
+// so the handoff chain between the module-authoring skills dead-ends.
+//
+// Rather than rewriting every reference at render time, the meta-skill
+// teaches the resolution rule once: a bare /X inside a Praxis skill means
+// the installed praxis-X. Guard that the rule is actually stated.
+func TestPraxisMetaSkill_TeachesPrefixResolutionRule(t *testing.T) {
+	body, err := ContentFor("praxis")
+	if err != nil {
+		t.Fatalf("ContentFor(praxis): %v", err)
+	}
+	for _, want := range []string{
+		"reserved namespace",
+		"/praxis-<name>",
+		"without the prefix",
+	} {
+		if !strings.Contains(body, want) {
+			t.Errorf("meta-skill missing prefix-resolution guidance %q — bare /X cross-references in catalog skills will dead-end", want)
+		}
+	}
+}